[#56995] 14.4 Documentation: Color of text and icons of primary butto…

docs/system-admin-guide/design/README.md

@@ -67,6 +67,10 @@ Aside from uploading logos and icons, you can also customize the colors used wit
 To do this change the color values (entered as color hex code) in the *Advanced settings* section. In order to find the right hex code for a color, you can use a website, such as [color-hex.com](https://www.color-hex.com/).
  You can see the selected color in the preview area next to the color hex code. Therefore, it is possible to see the selected color before saving the changes.
 
+> ![TIP]
+>If the button color you select is too light  to have white text on top of it, the icon and text color will be displayed in black instead.
+
+
 ![Advanced color settings in OpenProject](openproject_system_guide_design_advanced_settings_primer.png)
 
 As soon as you press the **Save** button your changes are applied and the colors of your OpenProject environment are adjusted accordingly.